Touch display panel with reduced thickness and manufacturing method thereof

Abstract

A touch display panel and a manufacturing method thereof are provided. The touch display panel includes a substrate, a conductor, a first pressure sensing electrode and a second pressure sensing electrode. The conductor is stacked under the substrate, and the conductor is not connected to a bias. The first pressure sensing electrode is disposed on the substrate and disposed above the conductor. A compression zone exists between the first pressure sensing electrode and the conductor, so as to form a first pressure sensing capacitor. The second pressure sensing electrode is disposed on the substrate and disposed above the conductor. The compression zone exists between the second pressure sensing electrode and the conductor, so as to form a second pressure sensing capacitor connected in series with the first pressure sensing capacitor.

What is claimed is: 
     
       1. A touch display panel, comprising:
 a first substrate; 
 a conductor, stacked under the first substrate, wherein the conductor is not connected to a bias; 
 a first pressure sensing electrode, disposed directly on the first substrate, and disposed above the conductor, wherein a compression zone exists between the first pressure sensing electrode and the conductor, so as to form a first pressure sensing capacitor; and 
 a second pressure sensing electrode, disposed directly on the first substrate, and disposed above the conductor, wherein the compression zone exists between the second pressure sensing electrode and the conductor, so as to form a second pressure sensing capacitor connected in series with the first pressure sensing capacitor, 
 wherein the compression zone comprises an entire region between the first pressure sensing electrode and the conductor, and an entire region between the second pressure sensing electrode and the conductor, and the compression zone is completely filled with an elastic material. 
 
     
     
       2. The touch display panel according to  claim 1 , further comprising:
 a second substrate, having a color filter layer stacked above the first substrate; 
 a liquid crystal layer, disposed between the first substrate and the second substrate; and 
 a thin-film transistor (TFT) array, disposed between the liquid crystal layer and the first substrate, wherein the first pressure sensing electrode and the second pressure sensing electrode are disposed in the TFT array. 
 
     
     
       3. The touch display panel according to  claim 2 , further comprising:
 a backlight module, having a metal reflector layer, stacked below the first substrate, wherein the compression zone exists between the backlight module and the first substrate, the metal reflector layer is configured to reflect a backlight to the liquid crystal layer, and the metal reflector layer is used as the conductor. 
 
     
     
       4. The touch display panel according to  claim 2 , further comprising:
 a backlight module, stacked below the first substrate, wherein the compression zone exists between the backlight module and the first substrate; and 
 a backlight frame, disposed under the backlight module to support the backlight module, wherein the backlight frame is used as the conductor. 
 
     
     
       5. The touch display panel according to  claim 1 , further comprising:
 a second substrate, stacked above the first substrate; 
 an organic light emitting diode (OLED) layer, disposed between the first substrate and the second substrate; and 
 a TFT array, disposed between the OLED layer and the first substrate, wherein the first pressure sensing electrode and the second pressure sensing electrode are disposed in the TFT array. 
 
     
     
       6. The touch display panel according to  claim 5 , further comprising:
 a mid frame, disposed under the first substrate to support the touch display panel, wherein the compression zone exists between the mid frame and the first substrate, and the mid frame is used as the conductor.